Questions tagged [generator]

A generator is a device that generates electricity from mechanical energy via different energy sources such as heat or kinetic energy of water.

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193 views

Can somebody please explain to me the principle of a T-T Earthing system?

How are the transformer, consumer's side and the generator earthed in a T-T Earthing system? I seem to understand that the generator and its frame should be earthed separately; The neutral of the ...
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0answers
57 views

Bulk power markets hour ending convention why?

Is there an engineering explanation for the hour ending (HE) convention common to US Independent System Operators (ISO)? For example, hover over any MISO real time market data and they will show the ...
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2answers
110 views

Power system - Economic dispatch

Quick concept related question, I have a system with 5 generation units and I have to find the maximum demand that the system can support and still be N-1 secure. their max outputs are: Unit A= 155, ...
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112 views

High Frequency Pulse Rate Generator - Science Fair

( For our High School Science Fair) I am trying to find a pulse rate generator capable of producing 2.5Hz - 20,000 Hz utilize with over 10,000 LEDs all at once with several milliseconds in between ...
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0answers
433 views

Draw relation of rotation speed and output power of PMAC generator with brake resistor

I would like to draw a graph showing the relationship between rotation speed and power of an ideal Sinus PMAC generator with a brake resistor R(load) to be defined controlled via a 4Q Controller ...
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24 views

Does transformer line side voltage varies with backup generator on load side running at from 0 to 100%?

We have a transformer of 750 KVA with 5.75% impedance. On the load side we have loads and a back-up emergency generator. This emergency generator is capable of supplying the loads and still export ...
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1answer
46 views

Is there a RF signal device for a 120 or 240 vac wire to start and stop a standby generator?

Our standby generators automatically start when a switch in the automatic transfer switch closes and the gen stops when that switch opens. Usually we bury 2 16ga wires along with two 120/240v hot and ...
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0answers
56 views

Ripple on tens-millivolts sinus waveform

I’m trying to make a DDS to generate a sinusoidal signal with tens to hundreds of millivolt amplitude and hundreds kHz frequency using an LTC1666 DAC. But I have some confusing results. Device ...
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1answer
27 views

What is the reason for compensation at async generator outputs?

I see capacitor banks are installed at async generator outputs. What is the function of compensation in this case? I thought compensation was done at the consumer and for induction motors. Can this ...
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1answer
85 views

What's the phase relation between the sine wave and the sync output from a function generator?

I'm using a function generator to generate a sine wave, and am trying to use the sync (TTL) output to flash an LED at the beginning of each wave pulse. However, when I compare the sin wave and the ...
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59 views

Generate energy from waves that move my ship?

I'm currently building a small solar powered robot boat. I expect it to work fine (because why not.. :-) ), but I'm already looking for other ways than only solar panels to generate electrical power. ...
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0answers
57 views

connecting 3 one phase Generator to get three phases

I have a big welder machine that needs around 26 kW and three phases. A generator for this power is a little bit expensive and take me a while to import one. When you are in a complicated situation ...
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40 views

Hook up an automatic transfer switch with two phases only

We have a house in Haiti connected to the shore line. The shore line isn't always working so we bought a generator. I wanted to ground one of the two phases to create one neutral, one phase and a ...
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1answer
56 views

How to optimze a coil for needed voltage?

Faraday's law for a coil is : V = A * M * N Where: V = Peak output-voltage A = Area of the cross-section of the wire M = Rate of change of magnetic flux in the coil N = Number of turns of the ...
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1answer
538 views

Grid tie inverter on Generator Set

I have a grid tie inverter powered by a 24V battery connected to a circuit that is on a Generator. The grid tie inverter syncs well and outputs 655 – 800W according to the Load. As the load changes ...
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109 views

Charging 3.7V battery from 300W+ generator

I am doing a project involving a bike generator of 500W. All of my previous projects were small LiPo battery powered devices so I want to double check certain aspects of this relatively high power ...
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178 views

Is this stackable low RPM generator design viable?

I'm trying to invent viable hand-crank energy generator for charging phones and similar low-power appliances. I want to avoid gears altogether in the design, because they are hard to manufacture at ...
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1answer
151 views

Generated current in a \$3\times450\$ VAC \$60\$ Hz \$1150\$ kVA generator

Let's say I've a \$3\times450\$ VAC \$60\$ Hz \$1150\$ kVA generator. How much current will there be generated when it runs at maximum capacity? MY WORK: The total Active power over a three-fase ...
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0answers
62 views

Change in frequency in a grid that has lost generation?

I have an example about droop and it asks to calculate final frequency in a grid after one generator power generation is lost. The answer is given as 59.889 Hz; however, I am calculating as 59.99 Hz. ...
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452 views

What might cause a fluctuating resistance of a generator winding?

Before assembly of a machine that contains a three phase generator I check the resistance between the 3 phases of the generator with an ohmmeter. The generator is kept stationary and the temperature ...
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128 views

Programmable GHz signals

I would like to generate custom waves in the gigahertz range. With beginner FPGAs like the DE0-Nano or microcontrollers like the Arduino, I can only generate waves up to the kilohertz range. What ...
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94 views

Why would venting an engine create a negative amperage on a generator?

I'm writing simulation software for a civilian helicopter. The helicopter has two engines and two generators. Normally, we calculate the amperage reading of a generator through Ohms. I = W / V. ...
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52 views

Does an HEV Genset need a controller?

I am part of a team at school that designs and builds a hybrid electric vehicle. We have chosen to use a series hybrid configuration, so we will be using a motor as a generator to charge lithium ...
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231 views

BLDC Motor and Generator, query about capacitor bank

I have 3 phase generator (believe to be Wye) which goes to 6 diode rectifier, the rpm can goes from 1000 to 5000. The output of the rectifer (50V say) has ripple on top which goes to 100W Motor ...
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290 views

Stepper motor as generator

The answer to "DC Motor as a Generator Voltage and Current" from Olin Lathrop included: "Sometimes these parameters can be inferred from other specs. For example, consider a motor that puts out ...
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0answers
565 views

Bottle dynamo (bike generator) rectification and stabilization circuit for LED light

A friend of mine would like to convert her bottle dynamo (bike generator) to run a LED light. The light needs to stay on for maybe 90 secs when the bike is stopped, and needs to blink (using a ...
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0answers
219 views

How much has the power density of electrical motors and generators changed in recent decades?

I would like to know how much lighter (if at all) a matched combination of an electrical motor and generator with a given power output would be today, compared to a similarly powerful combination ...
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29 views

How can a AC source be regulated to specific DC

Currently I am trying to power an Arduino project with a mechanical battery. I am using a stepper motor (NEMA23) as generator for it only needs low RPM to reach full potential (Around 600 RPM). Output ...
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42 views

What happens when you put two rectifiers in series to get DC from a stepper motor?

For a project a stepper motor is used as a generator because of the decent amount of power at low RPM. Now have found that one rectifier is sufficient when placing the coils in series. First however, ...
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38 views

Earthing portable generator directly to earth pin of powerpoint?

I have just bought a generator was wondering is there a reason I cant ground it to the earth pin on a power point in my home? Im thinking a cable with single earth wire and power plug on the end so I ...
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43 views

How do I calculate the Output current of a generator?

I got this axial flux generator form China for a small wind project. How should I calculate the output current (rated current) of this? I basically need this information for sizing the wire. The ...
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1answer
31 views

How do I calculate the regulation of the generator in a Ward-Leonard system?

I have a DC motor with independent excitation, power by a ward-leonard system. The nominal voltage applied to the motor is 250 V. I have to calculate what regulation(%) to apply to the generator so ...
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84 views

Gaussian filter circuit

I want to convert a 10 MHz train of square wave, 3.3 V to a Gaussian pulse train of the same frequency and amplitude. This Gaussian pulse will be sent into an electro-optical modulator where it ...
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1answer
50 views

Circuit to run a 3 phase magnet generator as motor?

I am trying to convert a wind generator to a brushless motor. As you can see at the image, it has 16 magnets and 12 coils. The coils are connected as 3 phase, star connection, so I have 3 output ...
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1answer
78 views

Why does rotor of synchoronous generator accelerate during faults?

I don't understand the electrical torque in a generator. Isn't the counter torque related to the armature current in the generator? Why does electrical torque decrease during fault in lines that ...
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30 views

How can I calculate the power capacity of a AC to DC converter?

This seems off topic, but will explain why I need to do what I am doing. I'm currently homeless, but need to build a generator on the cheap. I have a camper that uses 30a service. I have an ...
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14 views

Simplifying Salient Machine Impedance Parameters to Classical Synchronous Machine Model

I have a data sheet for generator impedance that specifies the quadrature and direct axis impedance for a salient machine. I'm not really interested in fully modeling the machine's for stability ...
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2answers
71 views

How to create a mechanical vibration?

I need to create a system which will make vibrate horizontally a plastic tube of diameter 4cm, of height 3cm, which axis is vertical, and whose weight is 11g. The frequency should be modifiable ...
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1answer
52 views

Simulation of the Micro-kinetic generator

I am simulating the block diagram of the Autoquartz system during unwinding in Simulink. I want to get the current of microgenerator (Ibus), but I get an oscillating pattern, which you can see here ....
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37 views

Advice on thermoelectric generators

Hey everyone I was curious if you could help me. There maybe several questions in this so bear with me. Btw I am not an engineer so try and keep it simple please. What variables are needed to find how ...
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34 views

Estimation of Synchronous Generator Mechanical Damping

We know that the no load acceleration torque of a synchronous generator is given by the equation (Ta = Tm -Te - Td) where Td = Dw and D being the damping due to rotor losses. Is there a way of ...
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25 views

Role of independent and dependent sources when calculating equivalent resistance

There are plenty of topics about this question, but I did not find a precise answer. Let's consider two points A and B of a generic circuit and suppose you want to find the equivalent resistance ...
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1answer
23 views

Efficiency Test of Permanent Magnet (PM) Motor With Variac&Fixed Resistance

We have a 3-phase permanent magnet motor and want to test its efficiency in generator mode. We can give a mechanical input power with an external motor (torque meter and tachometer installed) and we ...
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2answers
81 views

Induced EMF in electrical machines

I am currently working with machines and when I try to understand their principles in-depth, specifically in machines, I got to know that EMF is induced because of any of the two reasons: 1) Time-...
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25 views

Impact of Interconnection of One Energy Generating Plant At Another Generator Plant's Generator Bus Bar(PV Bus Bar)

As the scheme attached below, we're interconnecting 5.5 MW of generated power of upstream project(Around 2 km Away from the Interconnecting Switchyard) to the Generator Bus Bar(PV Bus Bar) on 11 kV ...
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1answer
37 views

Selecting an alternator/generator

I am designing anenergy regeneration system using a pulley attached to the wire rope of a track elevator using a 3:1 sprocket ratio I am getting around 670 RPM`s I am using two 6 volt lead acid ...
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1answer
30 views

How can you work out the internal resistance of a rectified 3 phase generator?

If there is a star topology 3 phase generator such as this- Connected to a full-wave diode rectifier such as this- Can you approximate the circuit to this-? (assuming steady state, DC load) If so, ...
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1answer
32 views

How does an optimized car battery charging system could be designed?

To start, I saw a scooter electrics. In that implementation, after quite a weak (in my sense) generator it has some shunt linear regulator, that just dissipates overvoltage to heat. Oh god! Weak ...
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27 views

Generator data for synchronizing

I have two DG sets which are to be synchronized on to the same AC bus and needless to say, they must share load. I have gathered some parametric data which I felt would decide how well these can work ...